Showing papers on "Stigmasterol published in 1974"
TL;DR: The unsaponifiables separated from 20 vegetable oils were divided into sterol and three other (less polar compound, triterpene alcohol, and 4-methylsterol) fractions by preparative thin layer chromatography as mentioned in this paper.
Abstract: The unsaponifiables separated from 20 vegetable oils were divided into sterol and three other (less polar compound, triterpene alcohol, and 4-methylsterol) fractions by preparative thin layer chromatography. The amounts of the sterol fractions were more than ca. 30% in the unsaponifiables from all of the oils, except tohaku, pumpkin seed, and fagara seed oils. Composition of the sterol fractions were determined by gas liquid chromatography. Individual components of the sterol fractions were identified by gas liquid chromatography and combined gas liquid chromatography-mass spectrometry. β-Sitosterol was found as the most predominant component in the sterol fractions from all oils, except two, i.e. the sterol fraction from pumpkin seed oil contained no detectable amount of β-sitosterol and the sterol fraction from akamegashiwa oil contained Δ5-avenasterol as the most abundant component. Campesterol, stigmasterol, Δ5-avenasterol, Δ7-stigmastenol, and Δ7-avenasterol and also trace amounts (at the very least) of cholesterol and brassicasterol were found in most of the oils analyzed. It may be noted that a large amount (ca. 9%) of cholesterol was detected in the sterol fraction from capsicum seed oil. The presence of 24-methylenecholesterol and Δ5-avenasterol in the sterol fraction of akamegashiwa oil was demonstrated by isolation of these sterols.
54 citations
TL;DR: Intracellular localization studies demonstrated that the membrane vesicles containing the UDP-glucose:sterol glucosyl transferase had a sucrose density gradient profile which was similar to that of several other enzymes thought to be involved in the synthesis of cell wall polysaccharides.
50 citations
TL;DR: Cholesterol and a number of other 4-demethyl sterols stimulated vegetative growth of Phytophthora infestans in liquid culture and on agar media and all sterols tested, including lanosterol, promoted the formation of sporangia by the fungus.
Abstract: Cholesterol and a number of other 4-demethyl sterols stimulated vegetative growth of Phytophthora infestans in liquid culture and on agar media. The 4,4′-dimethyl sterol lanosterol was inactive in this respect. A free 3-β-hydroxyl group appeared to be necessary for activity. All sterols tested, including lanosterol, promoted the formation of sporangia by the fungus. Lanosterol, inactive in stimulating vegetative growth, had very little effect on the stimulation of growth and sporulation by the active sterol, stigmasterol. The major 4-demethyl sterols in potato leaves were tentatively identified as cholesterol, stigmasterol and β-sitosterol. The other major sterol was the 4,4′dimethyl sterol, cycloartenol. Potato varieties differed in the relative amounts of these major sterol constituents present in the leaves. No relationship between the sterol content of potato leaves and resistance to infection by P. infestons was evident. Sterol preparations from a resistant and susceptible potato variety stimulated growth of P. infestons by a similar amount despite large differences between the preparations in the proportions of their constituents.
28 citations
TL;DR: The three major sterols accumulated during kernel development, but at a rate slower than dry weight, and free sterols and steryl ester content reached a maximum during the late stages of linear kernel growth.
Abstract: Kernels were collected from three maize (Zea mays L.) inbreds from 10 days after pollination until kernel maturity. Sitosterol, campesterol, and stigmasterol were the major sterols at all stages of kernel development. Cholesterol was less than 1% of the dry weight. The three major sterols accumulated during kernel development, but at a rate slower than dry weight. The ratio of the sterols did not vary greatly among the inbreds. At maturity, the three inbreds, Wf9, Oh43, and Ky226, had sterol levels of 325, 228, and 173 micrograms per kernel, respectively. Sitosterol accounted for 75 to 85% of the sterol. The relative amount of stigmasterol decreased during the linear phase of development, while sitosterol increased in the free fraction and campesterol increased in the steryl ester fraction.Free sterols and steryl esters were the major sterol fractions and steryl glycosides and acylated steryl glycosides were only minor components during kernel development. Free sterol content decreased rapidly in two maize inbreds between 10 and 26 days after pollination, but partially recovered in one of the inbreds during final stages of development. In the same two inbreds the steryl ester content reached a maximum during the late stages of linear kernel growth.
23 citations
20 citations
TL;DR: Naphthalene acetic acid increased the sterol content of mung bean hypocotyl sections mainly in the zone of elongation growth and during the 20-hr incubation period the stigmasterol: sitosterol ratio increased considerably.
18 citations
TL;DR: An additional sterol observed in bean leaves infected with Uromyces phaseoli was identified as 7,(Z)-24(28)-stigmastadien-3β-ol, which is the major sterol of the uredospores of the fungus.
18 citations
TL;DR: The wood of seven of the eighteen species of Diospyros examined contains small amounts of a blue pigment, diosindigo A [8,8′-dihydroxy-4,4′-dimethoxy-6,6′dimethyl-2,2′-binaphthylidene-1,1′-quinone(I; R1= Me, R2= OH).
Abstract: The wood of seven of the eighteen species of Diospyros examined contains small amounts of a blue pigment, diosindigo A [8,8′-dihydroxy-4,4′-dimethoxy-6,6′-dimethyl-2,2′-binaphthylidene-1,1′-quinone(I; R1= Me, R2= OH)]. Other extractives include plumbagin, 7-methyljuglone, isodiospyrin, mamegakinone, bergenin, lupeol, betulin, betulinic acid, oleanolic acid, β-sitosterol, and stigmasterol. Diosindigo A has been synthesised by the oxidation of 4-methoxy-6-methylnaphthalene-1,8-diol, prepared from 7-methyljuglone.
18 citations
TL;DR: The trunk wood of Micrandropsis scleroxylon W. Rodr.
17 citations
TL;DR: The six main adrenal sterols are found in both male and female rats of two different strains, and the 7-oxocholesterol and the 4-cholesten-3β, 6β-diol may be produced by cholesterol oxidation in the adrenals in vivo.
15 citations
TL;DR: In this paper, (S)-2-hydroxycuparene and 3,4′-ethylenebisphenol have been isolated from Marchantia polymorpha Linn, together with a mixture of campesterol, stigmasterol, and β-sitosterol.
Abstract: (S)-2-Hydroxycuparene and 3,4′-ethylenebisphenol have been isolated from Marchantia polymorpha Linn., together with a mixture of campesterol, stigmasterol, and β-sitosterol, and other terpenoid constituents. Syntheses of (R)-2-hydroxycuparene and of the bisphenol are reported.
TL;DR: Cannabis sativa L.9-trans-Tetrahydrocannabivarin, a mixture of sterols (campesterol, stigmasterol, and β-sitosterol), and the amino acid L-proline were isolated from an Indian variant of Cannabis sativa.
TL;DR: A phytochemical investigation of an ethanolic extract of the whole plant of Legnephora moorei Miers resulted in the isolation and characterization of the alkaloids dehydrocorydalmine, magnoflorine, laurifoline, and stepharine; the pentacyclic triterpene friedelin; and the sterol mixture cam-pesterol, stigmasterol, and sitosterol.
TL;DR: The study of the triterpenoids and their related substances of Euphorbia paralias resulted in isolation of ursolic acid, cycloartenol, 24-methylenecycloartenols, uvaol, a hydrocarbon fraction, alcohol fraction, and a sterol fraction.
Abstract: The study of the triterpenoids and their related substances of Euphorbia paralias resulted in isolation of ursolic acid, cycloartenol, 24-methylenecycloartenol, uvaol, a hydrocarbon fraction (n-C₂₉ n-C₃₅), alcohol fraction (hexacosanol and octacosanol) and a sterol fraction (β-sitosterol, stigmasterol, campesterol and cholesterol)
01 Jan 1974
TL;DR: In this article, various sterols and related steroids were tested for their ability to influence ethanol-induced electrolyte leakage and found that sterols protect rather than restore the structure of the plant.
Abstract: Varioussterols andrelated steroids weretested fortheir ability toinfluence ethanol-induced electrolyte leakage fron Hordeunm vulgare roots. Cholesterol hadthegreatest influence and,depending on concentration, itstimulated or inhibited thelossofelectrolyte. Cholesterol, however, wasineffective if therootswerepretreated withethanol. Thesedatasuggest that sterols protect rather thanrestoremembranestructure. First, modifications inthecholesterol perhydrocyclopentanophenanthrene ringsystemsuggest thatatleast onedoublebondisrequired formembraneactivity. Second, increasing thebulkiness oftheC1sidechainofcholesterol, asshownwithcampesterol, stigmasterol, andsitosterol, decreased itsactivity. Apparently formaximum effectiveness thesterol molecule shouldhavea relatively flatconfiguration. Third, theC3-hydroxyl groupis required formembraneactivity sincecholesteryl methylether, cholest-5-ene-3g-thiol andcholesteryl halogens were without activity. Exception totheforegoing rulewas cholestane which wasslightly active butwhichhasneither a C3-hydroxyl group noradoublebondintheringsystem.
TL;DR: Cholesterol, stigmasterol and β-sitosterol have been shown to be the main sterol compounds of the seeds and the presence of vitamin A, B1 and C in L. termis seeds has been demonstrated.
Abstract: Lupinus termis seeds contain appreciable amounts of lipids and sterols. The lipid and sterol contents varied with the variety of seeds and the extracting agent. Cholesterol, stigmasterol and β-sitosterol have been shown to be the main sterol compounds of the seeds. The presence of vitamin A, B1 and C inL. termis seeds has also been demonstrated. In Egypt,Lupinus termis seeds are mainly used for edible purpose. In a preceding paper (Abdel-Fattah et al. 1973) we reported on some constituents of these seeds, including carbohydrates, proteins and amino acids. For a further evaluation ofL. termis seeds we now report on their sterols and vitamins.
01 Jan 1974
TL;DR: The three major sterols accumulated during kernel development, but at a rate slower than dry weight, and free sterols and steryl ester content reached a maximum during the late stages of linear kernel growth.
Abstract: Kernels were collected from three maize (Zea mays L.) inbreds from 10 days after pollination until kernel maturity. Sitosterol, campesterol, and stigmasterol were the major sterols at all stages of kernel development. Cholesterol was less than 1 % of the dry weight. The three major sterols accumulated during kernel development, but at a rate slower than dry weight. The ratio of the sterols did not vary greatly among the inbreds. At maturity, the three inbreds, Wf9, Oh43, and Ky226, had sterol levels of 325, 228, and 173 micrograms per kernel, respectively. Sitosterol accounted for 75 to 85% of the sterol. The relative amount of stigmasterol decreased during the linear phase of development, while sitosterol increased in the free fraction and campesterol increased in the steryl ester fraction. Free sterols and steryl esters were the major sterol fractions and steryl glycosides and acylated steryl glycosides were only minor components during kernel development. Free sterol content decreased rapidly in two maize inbreds between 10 and 26 days after pollination, but partially recovered in one of the inbreds during final stages of development. In the same two inbreds the steryl ester content reached a maximum during the late stages of linear kernel growth.